US20060096452A1 - Piston arrangement of a hydraulic actuating device on motor vehicles - Google Patents
Piston arrangement of a hydraulic actuating device on motor vehicles Download PDFInfo
- Publication number
- US20060096452A1 US20060096452A1 US11/261,353 US26135305A US2006096452A1 US 20060096452 A1 US20060096452 A1 US 20060096452A1 US 26135305 A US26135305 A US 26135305A US 2006096452 A1 US2006096452 A1 US 2006096452A1
- Authority
- US
- United States
- Prior art keywords
- insert
- piston
- recess
- ram
- stop
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C11/00—Pivots; Pivotal connections
- F16C11/04—Pivotal connections
- F16C11/06—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints
- F16C11/0685—Manufacture of ball-joints and parts thereof, e.g. assembly of ball-joints
- F16C11/069—Manufacture of ball-joints and parts thereof, e.g. assembly of ball-joints with at least one separate part to retain the ball member in the socket; Quick-release systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
- B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
- B60T11/16—Master control, e.g. master cylinders
- B60T11/18—Connection thereof to initiating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C11/00—Pivots; Pivotal connections
- F16C11/04—Pivotal connections
- F16C11/06—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints
- F16C11/0619—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints the female part comprising a blind socket receiving the male part
- F16C11/0623—Construction or details of the socket member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D25/00—Fluid-actuated clutches
- F16D25/08—Fluid-actuated clutches with fluid-actuated member not rotating with a clutching member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D25/00—Fluid-actuated clutches
- F16D25/08—Fluid-actuated clutches with fluid-actuated member not rotating with a clutching member
- F16D25/088—Fluid-actuated clutches with fluid-actuated member not rotating with a clutching member the line of action of the fluid-actuated members being distinctly separate from the axis of rotation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J1/00—Pistons; Trunk pistons; Plungers
- F16J1/10—Connection to driving members
- F16J1/14—Connection to driving members with connecting-rods, i.e. pivotal connections
- F16J1/22—Connection to driving members with connecting-rods, i.e. pivotal connections with universal joint, e.g. ball-joint
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D25/00—Fluid-actuated clutches
- F16D25/08—Fluid-actuated clutches with fluid-actuated member not rotating with a clutching member
- F16D2025/081—Hydraulic devices that initiate movement of pistons in slave cylinders for actuating clutches, i.e. master cylinders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D48/00—External control of clutches
- F16D48/02—Control by fluid pressure
- F16D2048/0212—Details of pistons for master or slave cylinders especially adapted for fluid control
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T403/00—Joints and connections
- Y10T403/32—Articulated members
- Y10T403/32606—Pivoted
- Y10T403/32631—Universal ball and socket
- Y10T403/32786—Divided socket-type coupling
Definitions
- the invention relates to a piston arrangement for master and/or slave cylinders of a hydraulic actuating device for clutch and/or brake systems on motor vehicles.
- a piston arrangement for one of a master and slave cylinder of a hydraulic actuating device for one of a clutch and brake system on a motor vehicle comprising
- a piston having an outer end with a recess
- an insert suitable for fixing in the recess said insert having a ball seat and an insertion sleeve which is undercut with respect to the ball seat, said insertion sleeve having slits and thus being expandable and, when it is fully inserted in the recess, being tightly enclosed by a piston wall which delimits the recess, and
- a ram which transmits actuating travels and forces, said ram having a ball end which is shaped so as to be complementary to the ball seat, which ball end can be coupled to the insert in order to mount the ram in an articulated manner via a snap connection brought about by the expandable insertion sleeve;
- the insert is provided with a peripheral chamfer or the like at its inner end, said peripheral chamfer being assigned, within the recess of the piston, a first stop for delimiting a first insertion travel of the insert in the recess, wherein, for bringing about the snap connection, the insert bearing against the first stop protrudes outwards with its expandable insertion sleeve substantially out of the recess of the piston,
- the insert is introduced into the recess of the piston until the peripheral chamfer of the insert strikes the first travel-delimiting stop.
- the insertion sleeve of the insert which can be expanded to produce the snap connection, protrudes out of the recess of the piston.
- the ram which is then pushed with its end ball first into the insertion sleeve in the axial direction of the piston drives the end ball with the axial force required to overcome the spring forces of the insertion sleeve until it meets the ball seat in the insert, as a result of which the snap connection is brought about.
- the insert remains against its first stop in the recess of the piston because the axial pressure force required to produce the snap connection is smaller than the axial pressure force which has to be exerted on the ram in order to slide over the first stop, that is to say is smaller than the retaining force at the first stop.
- the insert slides over the first stop in the recess of the piston, with partial elastic and also plastic deformation of the regions of the insert which bear against the first stop.
- the second insertion travel of the insert which starts at this point, is delimited by the second stop at the inner end of the recess.
- the expandable insertion sleeve of the insert is located within the recess and is tightly enclosed by the piston wall delimiting the recess. In this position, the end ball of the ram is located without play in the ball seat and cannot be pulled out of the insert and the insert cannot be pulled out of the piston, even if very high pull-out forces are applied.
- the design of the piston arrangement according to the invention permits very simple assembly, in which the ram is driven with its end ball in a single axial movement into the insert inserted in the piston, wherein firstly the snap connection is brought about and immediately thereafter the insert is pushed into its final position in the recess. This does not lead to any deformation of the ball-and-socket joint which would give rise to play, since the transmission of pressure forces to the insert takes place via the form-fitting full bearing between end ball and ball seat.
- the recess is designed as an elongate blind hole with a certain profiling which also produces the first and second stop for the insert.
- the insert is designed with an inner cylindrical section and an outer cylindrical section of larger diameter, in a manner adapted to the profiling of the elongate blind hole, in order to ensure the abovementioned simple assembly and the ability to withstand even very high pull-out forces.
- grooves are provided on the circumferential surface of the inner section of the insert in a uniformly distributed manner, which grooves reduce the bearing surface contact with that cylindrical hole section of the elongate blind hole which is slid over when the retaining force of the first stop is overcome by partial elastic/plastic deformation of the relevant region, as a result of which the necessary axial press-in force is reduced at the same time.
- Some of these grooves may have a greater axial length than the others, in order to evacuate air from the inner closed region of the elongate blind hole in the piston as the insert is pushed in.
- the deformability of the inner section of the insert during the press-in operation may advantageously be increased by virtue of a concentric cut-out in the end face of its inner section, and thus the axial force required to press it in can be reduced.
- the bearing surface portion of the insertion sleeve as it is pressed into the outer, first hole section of the elongate blind hole can also advantageously be reduced, and this also reduces the necessary axial press-in force.
- a design of the ball end of the ram according to which the ball end is shaped so as to be free of any ridges in its surface regions which transmit pressure forces and tensile forces, allows the completely ridge-free moulding of an ideal ball joint, so that a play-free fit in the ball seat of the insert is made possible.
- the materials for the three components of the piston arrangement are selected from aluminum, aluminum alloy and plastic.
- aluminum or an aluminum alloy for the piston the latter can be designed to be relatively very thin-walled in the region of the insertion sleeve of the insert, without any strength considerations and without any fear of deformations of the piston wall when the insert is pressed in or in the event of axial tensile stresses via the ram.
- the insert preferably molded from plastic as the ram, can also be given a larger diameter in this region, and this in turn permits an advantageously large ball seat and ball diameter.
- FIG. 1 shows the longitudinal section through the assembled piston arrangement, with a guide sleeve which encloses the piston, in which guide sleeve the piston is displaceably guided and which guide sleeve is pushed into a housing of a master or slave cylinder and is fixed therein, said housing being shown broken open,
- FIG. 2 shows a broken-open longitudinal section through the outer end of the piston and the recess provided therein
- FIG. 3 shows a perspective view of the insert
- FIG. 4 shows the front view of the insert, seen in the direction of arrow IV in FIG. 3 ,
- FIG. 5 shows the sectional view of the insert along the section line V-V in FIG. 4 .
- FIG. 6 shows a broken-open longitudinal section through the outer piston end corresponding to FIG. 2 , but with the insert pushed into the recess up to the first stop,
- FIG. 7 shows a broken-open longitudinal section through the outer piston end and through the insert in a manner similar to FIG. 6 , but with the guide sleeve pushed onto the piston and with the ball end of the ram brought up to the insertion sleeve of the insert,
- FIG. 8 shows a longitudinal section corresponding to FIG. 7 , but after the snap connection of the ball end with the insertion sleeve of the insert has been brought about
- FIG. 9 shows a longitudinal section corresponding to FIGS. 7 and 8 , but after complete assembly of the piston arrangement with the insert pressed into the recess until it reaches the second stop.
- FIGS. 2 to 9 are in turn shown on an enlarged scale compared to FIG. 1 .
- the piston 2 is a so-called plunger piston which has a cylindrical outer circumferential surface which is guided displaceably in a sealed manner in the guide sleeve 3 and can be moved in the pushing and pulling direction by means of the ram 4 .
- the piston 2 has a recess 5 in its outer end, said recess being designed as an elongate blind hole which is concentric with the central axis of the piston 2 and has a number of cylindrical hole sections of different diameter, as can best be seen from FIG. 2 and will be described in more detail below.
- An insert 6 suitable for fixing in the recess 5 has a ball seat 7 and an insertion sleeve 8 which is undercut with respect to the ball seat 7 .
- the insertion sleeve 8 has slits and is thus expandable, in a manner to be described in more detail below. When it is fully inserted in the recess 5 , the insertion sleeve 8 is tightly enclosed by the piston wall which delimits the recess 5 , as can be seen in FIGS. 1 and 9 .
- the ram 4 which transmits the actuating travels and forces is provided with a ball end 9 which is shaped so as to be complementary to the ball seat 7 in the insert 6 , which ball end 9 can be coupled to the insert 6 in order to mount the ram 4 in an articulated manner via a snap connection brought about by the expandable insertion sleeve 8 .
- the achieved coupling is shown in FIGS. 1, 8 and 9 .
- the recess 5 designed as an elongate blind hole has essentially four hole sections, of which the outer, first hole section 10 has the largest diameter d 1 which is adapted to the external diameter of the insertion sleeve 8 of the insert 6 .
- the first hole section 10 is followed by a comparatively smaller diameter d 2 ′ of the second hole section 11 .
- This is followed by the third hole section 12 which has an only slightly smaller diameter d 2 with a transitional chamfer 13 which forms a first stop for the insert 6 .
- the third hole section 12 ends with a sharp edge 15 produced by an annular groove 14 , so that, seen from the outside in, an undercut is formed behind the third hole section 12 .
- the annular groove 14 is followed by the fourth hole section 16 which adjoins the annular groove 14 with a conical transition face 17 and which has a diameter d 3 that is larger than the diameters d 2 ′ and d 2 of the second and third hole sections 11 and 12 , respectively.
- the recess 5 ends, after the fourth hole section 16 , at a face 18 perpendicular to the central axis of the piston 2 , which face 18 forms a second stop for the insert 6 .
- the insert 6 is provided at its inner end with a peripheral chamfer 19 which may also be designed as an edge rounding. This peripheral chamfer 19 strikes the transitional chamfer 13 which forms the first travel-delimiting stop when the insert 6 is introduced into the recess 5 .
- the insert 6 has two essentially cylindrical sections 20 and 21 , of which the outer section 20 has the larger diameter and forms the insertion sleeve 8 .
- the latter is expandable by virtue of a number of axis-parallel slits 22 , in the illustrated example by virtue of six slits 22 , in its wall which are distributed uniformly over the circumference, said slits forming resilient tongues 23 , in the example of embodiment six tongues 23 .
- the inner section 21 of the insert 6 has the smaller diameter which forms a press fit with the diameter d 2 of the third hole section 12 of the recess 5 of the piston 2 .
- the inner section 21 of the insert 6 has in its circumferential surface a number of axis-parallel grooves 25 which continue up to its end face 24 , some of which grooves 25 ′ have a greater axial length and serve to evacuate air from the recess 5 as the insert 6 is pressed into the latter.
- the grooves 25 , 25 ′ reduce the bearing surface portion of the inner section 21 relative to the third hole section 12 and therefore reduce the necessary press-in forces.
- the insert 6 has a concentric cut-out 26 in the end face 24 of its inner section 21 , which facilitates deformations of the inner end of the inner section 21 during the press-in operation, and on the other hand in that the insertion sleeve 8 of the insert 6 has a number of axis-parallel small ribs 27 distributed over its outer circumference, which ribs reduce the bearing surface of the outer section 20 of the insert 6 relative to the wall surface of the first hole section 10 .
- the ball end 9 of the ram 4 is molded so as to be free of any ridges in its surface regions which transmit pressure forces and tensile forces, as a result of which the ball-and-socket joint formed of the ball seat 7 and the ball end 9 can be manufactured with narrow tolerances and practically without any play, since no deformable and thus play-forming ridge is present in the area of contact of the convex and concave ball surfaces.
- Suitable material pairings are obtained when the piston 2 is made of aluminum or an aluminum alloy, whereas the insert 6 and the ram 4 with its ball end 9 are molded from thermoplastic plastics.
- thermoplastic plastics By way of example, glass-fiber-reinforced polyamides are suitable for this purpose.
- FIGS. 6 to 9 The order of the operating steps for assembling the described piston arrangement is shown in FIGS. 6 to 9 .
- the insert 6 is pushed with its inner section 21 into the second hole section 11 and at the same time with its outer section 20 into the first hole section 10 , until the peripheral chamfer 19 strikes the transitional chamfer 13 which forms the first travel-delimiting stop.
- the insert 6 protrudes with its expandable insertion sleeve 8 substantially out of the recess 5 of the piston 2 , as shown in FIG. 6 .
- the piston 2 and the insert 6 are thus ready to produce the snap connection.
- the piston 2 with the insert 6 can now be pushed into the guide sleeve 3 , as shown in FIG. 7 .
- the ram 4 is introduced by its ball end 9 through an opening 28 in the end wall of the guide sleeve 3 until it reaches the insertion sleeve 8 , wherein it strikes a peripheral chamfer 29 of the insertion sleeve 8 , said peripheral chamfer 29 being shaped approximately like a truncated cone and allowing expansion of the insertion sleeve 8 .
- the axial pressure force to be exerted on the ram 4 in order to bring about the snap connection is smaller than the axial pressure force to be exerted on the ram 4 in order to slide over the first stop.
- the insert 6 therefore remains at the first travel-delimiting stop in the position shown in FIGS. 7 and 8 while the snap connection is produced, that is to say the peripheral chamfer 19 of the insert 6 is pressed against the transitional chamfer 13 between the second and third hole sections 11 and 12 .
- a piston arrangement for master and/or slave cylinders of a hydraulic actuating device for clutch and/or brake systems on motor vehicles which piston arrangement is characterized by simplified manufacture and assembly of its components and also withstands high pull-out forces introduced via the ram.
- a suitable insert is inserted into a recess of the piston up to a first stop, said recess being designed as an elongate blind hole.
- the insert has a ball seat and an expandable insertion sleeve which is undercut with respect to the ball seat and initially protrudes outwards with its expandable region.
- the ram is pushed into the expandable insertion sleeve in the axial direction with its ball end which is shaped so as to be complementary to the ball seat, until the ball end snaps into the ball seat.
- the insert slides over the first stop, is firmly pressed into a narrow hole section of the recess and finally strikes a travel-delimiting second stop at the inner end of the recess. In this position, the insertion sleeve is tightly enclosed by the piston wall and can no longer expand even in the event of very high pull-out forces, that is to say cannot release the ball end of the ram.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Transmission Of Braking Force In Braking Systems (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
Description
- The invention relates to a piston arrangement for master and/or slave cylinders of a hydraulic actuating device for clutch and/or brake systems on motor vehicles.
- In a known piston arrangement of this type (DE 100 62 988 A1), assembly is carried out in two separate steps. Firstly, the snap connection is brought about between the ram and the insert, referred to in said document as the piston link head. The unit preassembled in this way is then inserted into the recess and screwed into the latter by means of a threaded engagement. For this purpose, the recess is provided with an internal thread and the insert is provided with a corresponding external thread. On account of the threaded engagement, this known piston arrangement is expensive to manufacture, and special measures moreover have to be taken in order to prevent loosening of the screw connection. In terms of the requirements in mass production, assembly in two steps is complicated, wherein the handling of the preassembled unit consisting of the ram and the insert is made more difficult on account of the ball-and-socket connection of these parts.
- It is an object of the invention to simplify the manufacture and assembly of such piston arrangement and to fix the insert in the recess of the piston so that it is secured against high pull-out forces introduced via the ram, even without threaded engagement.
- According to the invention, there is provided a piston arrangement for one of a master and slave cylinder of a hydraulic actuating device for one of a clutch and brake system on a motor vehicle, comprising
- a piston having an outer end with a recess,
- an insert suitable for fixing in the recess, said insert having a ball seat and an insertion sleeve which is undercut with respect to the ball seat, said insertion sleeve having slits and thus being expandable and, when it is fully inserted in the recess, being tightly enclosed by a piston wall which delimits the recess, and
- a ram which transmits actuating travels and forces, said ram having a ball end which is shaped so as to be complementary to the ball seat, which ball end can be coupled to the insert in order to mount the ram in an articulated manner via a snap connection brought about by the expandable insertion sleeve;
- wherein the insert is provided with a peripheral chamfer or the like at its inner end, said peripheral chamfer being assigned, within the recess of the piston, a first stop for delimiting a first insertion travel of the insert in the recess, wherein, for bringing about the snap connection, the insert bearing against the first stop protrudes outwards with its expandable insertion sleeve substantially out of the recess of the piston,
- an axial pressure force that is to be exerted on the ram in order to bring about the snap connection being smaller than an axial pressure force that is to be exerted on the ram in order for the insert to slide over the first stop in the recess, and
- a second insertion travel of the insert which starts with the sliding-over being delimited by a second stop at the inner end of the recess.
- In the piston arrangement designed according to the invention, firstly the insert is introduced into the recess of the piston until the peripheral chamfer of the insert strikes the first travel-delimiting stop. At the end of this first insertion travel, the insertion sleeve of the insert, which can be expanded to produce the snap connection, protrudes out of the recess of the piston.
- The ram which is then pushed with its end ball first into the insertion sleeve in the axial direction of the piston drives the end ball with the axial force required to overcome the spring forces of the insertion sleeve until it meets the ball seat in the insert, as a result of which the snap connection is brought about. During this, the insert remains against its first stop in the recess of the piston because the axial pressure force required to produce the snap connection is smaller than the axial pressure force which has to be exerted on the ram in order to slide over the first stop, that is to say is smaller than the retaining force at the first stop.
- When the axial pressure force on the ram is increased, the insert slides over the first stop in the recess of the piston, with partial elastic and also plastic deformation of the regions of the insert which bear against the first stop. The second insertion travel of the insert, which starts at this point, is delimited by the second stop at the inner end of the recess. Once the insert bears against the second stop, the expandable insertion sleeve of the insert is located within the recess and is tightly enclosed by the piston wall delimiting the recess. In this position, the end ball of the ram is located without play in the ball seat and cannot be pulled out of the insert and the insert cannot be pulled out of the piston, even if very high pull-out forces are applied.
- The design of the piston arrangement according to the invention permits very simple assembly, in which the ram is driven with its end ball in a single axial movement into the insert inserted in the piston, wherein firstly the snap connection is brought about and immediately thereafter the insert is pushed into its final position in the recess. This does not lead to any deformation of the ball-and-socket joint which would give rise to play, since the transmission of pressure forces to the insert takes place via the form-fitting full bearing between end ball and ball seat.
- Continuing the concept of the invention, the recess is designed as an elongate blind hole with a certain profiling which also produces the first and second stop for the insert. Accordingly, the insert is designed with an inner cylindrical section and an outer cylindrical section of larger diameter, in a manner adapted to the profiling of the elongate blind hole, in order to ensure the abovementioned simple assembly and the ability to withstand even very high pull-out forces.
- Preferably, grooves are provided on the circumferential surface of the inner section of the insert in a uniformly distributed manner, which grooves reduce the bearing surface contact with that cylindrical hole section of the elongate blind hole which is slid over when the retaining force of the first stop is overcome by partial elastic/plastic deformation of the relevant region, as a result of which the necessary axial press-in force is reduced at the same time. Some of these grooves may have a greater axial length than the others, in order to evacuate air from the inner closed region of the elongate blind hole in the piston as the insert is pushed in.
- The deformability of the inner section of the insert during the press-in operation may advantageously be increased by virtue of a concentric cut-out in the end face of its inner section, and thus the axial force required to press it in can be reduced. By virtue of ribs on the outer circumference of the insertion sleeve of the insert, the bearing surface portion of the insertion sleeve as it is pressed into the outer, first hole section of the elongate blind hole can also advantageously be reduced, and this also reduces the necessary axial press-in force.
- A design of the ball end of the ram according to which the ball end is shaped so as to be free of any ridges in its surface regions which transmit pressure forces and tensile forces, allows the completely ridge-free moulding of an ideal ball joint, so that a play-free fit in the ball seat of the insert is made possible.
- Advantageously, the materials for the three components of the piston arrangement are selected from aluminum, aluminum alloy and plastic. By using aluminum or an aluminum alloy for the piston, the latter can be designed to be relatively very thin-walled in the region of the insertion sleeve of the insert, without any strength considerations and without any fear of deformations of the piston wall when the insert is pressed in or in the event of axial tensile stresses via the ram. As a result, the insert, preferably molded from plastic as the ram, can also be given a larger diameter in this region, and this in turn permits an advantageously large ball seat and ball diameter.
- For a better understanding of the invention and to show how the same may be carried into effect, reference will now be made, by way of example, to the accompanying drawings, in which:
-
FIG. 1 shows the longitudinal section through the assembled piston arrangement, with a guide sleeve which encloses the piston, in which guide sleeve the piston is displaceably guided and which guide sleeve is pushed into a housing of a master or slave cylinder and is fixed therein, said housing being shown broken open, -
FIG. 2 shows a broken-open longitudinal section through the outer end of the piston and the recess provided therein, -
FIG. 3 shows a perspective view of the insert, -
FIG. 4 shows the front view of the insert, seen in the direction of arrow IV inFIG. 3 , -
FIG. 5 shows the sectional view of the insert along the section line V-V inFIG. 4 , -
FIG. 6 shows a broken-open longitudinal section through the outer piston end corresponding toFIG. 2 , but with the insert pushed into the recess up to the first stop, -
FIG. 7 shows a broken-open longitudinal section through the outer piston end and through the insert in a manner similar toFIG. 6 , but with the guide sleeve pushed onto the piston and with the ball end of the ram brought up to the insertion sleeve of the insert, -
FIG. 8 shows a longitudinal section corresponding toFIG. 7 , but after the snap connection of the ball end with the insertion sleeve of the insert has been brought about, and -
FIG. 9 shows a longitudinal section corresponding toFIGS. 7 and 8 , but after complete assembly of the piston arrangement with the insert pressed into the recess until it reaches the second stop. - The piston arrangement, the parts of the master or slave cylinder connected thereto and its individual parts are shown in the drawings on an enlarged scale compared to the actual dimensions for illustrative purposes, wherein FIGS. 2 to 9 are in turn shown on an enlarged scale compared to
FIG. 1 . - Of the master or slave cylinder, only the part of the
housing 1 which accommodates the piston arrangement is shown broken open inFIG. 1 , since the invention does not extend to the design of the master or slave cylinder. The same applies in respect of the arrangement of seals between thehousing 1 and theguide sleeve 3 which encloses thepiston 2 and the seal arrangements to be fitted at the inner end of thepiston 2, none of said seals or seal arrangements being shown inFIG. 1 . Thepiston 2 is a so-called plunger piston which has a cylindrical outer circumferential surface which is guided displaceably in a sealed manner in theguide sleeve 3 and can be moved in the pushing and pulling direction by means of theram 4. - The
piston 2 has arecess 5 in its outer end, said recess being designed as an elongate blind hole which is concentric with the central axis of thepiston 2 and has a number of cylindrical hole sections of different diameter, as can best be seen fromFIG. 2 and will be described in more detail below. Aninsert 6 suitable for fixing in therecess 5 has aball seat 7 and aninsertion sleeve 8 which is undercut with respect to theball seat 7. Theinsertion sleeve 8 has slits and is thus expandable, in a manner to be described in more detail below. When it is fully inserted in therecess 5, theinsertion sleeve 8 is tightly enclosed by the piston wall which delimits therecess 5, as can be seen inFIGS. 1 and 9 . - The
ram 4 which transmits the actuating travels and forces is provided with aball end 9 which is shaped so as to be complementary to theball seat 7 in theinsert 6, whichball end 9 can be coupled to theinsert 6 in order to mount theram 4 in an articulated manner via a snap connection brought about by theexpandable insertion sleeve 8. The achieved coupling is shown inFIGS. 1, 8 and 9. - As can be seen from
FIG. 2 , therecess 5 designed as an elongate blind hole has essentially four hole sections, of which the outer,first hole section 10 has the largest diameter d1 which is adapted to the external diameter of theinsertion sleeve 8 of theinsert 6. Thefirst hole section 10 is followed by a comparatively smaller diameter d2′ of thesecond hole section 11. This is followed by thethird hole section 12 which has an only slightly smaller diameter d2 with atransitional chamfer 13 which forms a first stop for theinsert 6. Thethird hole section 12 ends with asharp edge 15 produced by anannular groove 14, so that, seen from the outside in, an undercut is formed behind thethird hole section 12. Theannular groove 14 is followed by thefourth hole section 16 which adjoins theannular groove 14 with aconical transition face 17 and which has a diameter d3 that is larger than the diameters d2′ and d2 of the second andthird hole sections recess 5 ends, after thefourth hole section 16, at aface 18 perpendicular to the central axis of thepiston 2, which face 18 forms a second stop for theinsert 6. - In order to describe the
insert 6, reference will now be made to FIGS. 3 to 5. Theinsert 6 is provided at its inner end with aperipheral chamfer 19 which may also be designed as an edge rounding. Thisperipheral chamfer 19 strikes thetransitional chamfer 13 which forms the first travel-delimiting stop when theinsert 6 is introduced into therecess 5. Theinsert 6 has two essentiallycylindrical sections outer section 20 has the larger diameter and forms theinsertion sleeve 8. The latter is expandable by virtue of a number of axis-parallel slits 22, in the illustrated example by virtue of sixslits 22, in its wall which are distributed uniformly over the circumference, said slits formingresilient tongues 23, in the example of embodiment sixtongues 23. Theinner section 21 of theinsert 6 has the smaller diameter which forms a press fit with the diameter d2 of thethird hole section 12 of therecess 5 of thepiston 2. - The
inner section 21 of theinsert 6 has in its circumferential surface a number of axis-parallel grooves 25 which continue up to itsend face 24, some of whichgrooves 25′ have a greater axial length and serve to evacuate air from therecess 5 as theinsert 6 is pressed into the latter. For the rest, however, thegrooves inner section 21 relative to thethird hole section 12 and therefore reduce the necessary press-in forces. Comparable effects are achieved on the one hand in that theinsert 6 has a concentric cut-out 26 in theend face 24 of itsinner section 21, which facilitates deformations of the inner end of theinner section 21 during the press-in operation, and on the other hand in that theinsertion sleeve 8 of theinsert 6 has a number of axis-parallelsmall ribs 27 distributed over its outer circumference, which ribs reduce the bearing surface of theouter section 20 of theinsert 6 relative to the wall surface of thefirst hole section 10. - The ball end 9 of the
ram 4 is molded so as to be free of any ridges in its surface regions which transmit pressure forces and tensile forces, as a result of which the ball-and-socket joint formed of theball seat 7 and the ball end 9 can be manufactured with narrow tolerances and practically without any play, since no deformable and thus play-forming ridge is present in the area of contact of the convex and concave ball surfaces. - Suitable material pairings are obtained when the
piston 2 is made of aluminum or an aluminum alloy, whereas theinsert 6 and theram 4 with itsball end 9 are molded from thermoplastic plastics. By way of example, glass-fiber-reinforced polyamides are suitable for this purpose. - The order of the operating steps for assembling the described piston arrangement is shown in FIGS. 6 to 9. Firstly, the
insert 6 is pushed with itsinner section 21 into thesecond hole section 11 and at the same time with itsouter section 20 into thefirst hole section 10, until theperipheral chamfer 19 strikes thetransitional chamfer 13 which forms the first travel-delimiting stop. In this position of the parts, theinsert 6 protrudes with itsexpandable insertion sleeve 8 substantially out of therecess 5 of thepiston 2, as shown inFIG. 6 . Thepiston 2 and theinsert 6 are thus ready to produce the snap connection. - The
piston 2 with theinsert 6 can now be pushed into theguide sleeve 3, as shown inFIG. 7 . Theram 4 is introduced by itsball end 9 through anopening 28 in the end wall of theguide sleeve 3 until it reaches theinsertion sleeve 8, wherein it strikes aperipheral chamfer 29 of theinsertion sleeve 8, saidperipheral chamfer 29 being shaped approximately like a truncated cone and allowing expansion of theinsertion sleeve 8. As the insertion operation continues, theresilient tongues 23 now move laterally outwards, until they snap behind the ball end 9 as a result of the undercut in front of theball seat 7, wherein the ball end 9 passes in a form-fitting manner into theball seat 7. This position is shown inFIG. 8 . - The axial pressure force to be exerted on the
ram 4 in order to bring about the snap connection is smaller than the axial pressure force to be exerted on theram 4 in order to slide over the first stop. Theinsert 6 therefore remains at the first travel-delimiting stop in the position shown inFIGS. 7 and 8 while the snap connection is produced, that is to say theperipheral chamfer 19 of theinsert 6 is pressed against thetransitional chamfer 13 between the second andthird hole sections - If the axial pressure force on the
ram 4 is now increased, theinsert 6 thus slides over the first stop with partial elastic and plastic deformation of the front end of itsinner section 21, since the retaining force of the first stop is overcome. A second insertion travel of theinsert 6 is thus started, said second insertion travel being delimited and therefore ended by theend face 24 striking theface 18 of therecess 5 which forms the second stop. This position of the parts can be seen fromFIG. 9 and alsoFIG. 1 . In practice, the insertion of theram 4 by itsball end 9 is not carried out in two insertion movements which are separated from one another over time, but rather takes place in a single, coherent press-in operation. - Behind the
sharp edge 15, the operation of pressing in and sliding over the first stop leads to a partial elastic back-deformation of theinsert 6, so that the latter is held in therecess 5 in the position shown inFIGS. 1 and 9 even against very high pull-out forces introduced via theram 4. Since theinsertion sleeve 8 is also completely enclosed by the solid wall of thepiston 2, very high pull-out forces moreover cannot pull theball end 9 out of theball seat 7 since theresilient tongues 23 cannot move out to the side. - There is thus proposed a piston arrangement for master and/or slave cylinders of a hydraulic actuating device for clutch and/or brake systems on motor vehicles, which piston arrangement is characterized by simplified manufacture and assembly of its components and also withstands high pull-out forces introduced via the ram. A suitable insert is inserted into a recess of the piston up to a first stop, said recess being designed as an elongate blind hole. The insert has a ball seat and an expandable insertion sleeve which is undercut with respect to the ball seat and initially protrudes outwards with its expandable region. The ram is pushed into the expandable insertion sleeve in the axial direction with its ball end which is shaped so as to be complementary to the ball seat, until the ball end snaps into the ball seat. As the ram continues to be pressed in the axial direction, the insert slides over the first stop, is firmly pressed into a narrow hole section of the recess and finally strikes a travel-delimiting second stop at the inner end of the recess. In this position, the insertion sleeve is tightly enclosed by the piston wall and can no longer expand even in the event of very high pull-out forces, that is to say cannot release the ball end of the ram.
Claims (10)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004053913A DE102004053913B3 (en) | 2004-11-05 | 2004-11-05 | Piston arrangement of a hydraulic actuator on motor vehicles |
DE102004053913.8 | 2004-11-05 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20060096452A1 true US20060096452A1 (en) | 2006-05-11 |
US7188563B2 US7188563B2 (en) | 2007-03-13 |
Family
ID=35478819
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/261,353 Expired - Fee Related US7188563B2 (en) | 2004-11-05 | 2005-10-28 | Piston arrangement of a hydraulic actuating device on motor vehicles |
Country Status (3)
Country | Link |
---|---|
US (1) | US7188563B2 (en) |
EP (1) | EP1655521B1 (en) |
DE (2) | DE102004053913B3 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2924185A1 (en) * | 2007-11-28 | 2009-05-29 | Valeo Embrayages | Clutch master cylinder for clutch of motor vehicle, has collar with front side cooperating with rear edge of piston, where rod is separated angularly above determined angle, where collar applies axial compression force on piston |
CN101196208B (en) * | 2006-12-07 | 2011-10-12 | 施塔比鲁斯有限责任公司 | Ball joint arrangement |
CN102913506A (en) * | 2012-11-09 | 2013-02-06 | 浙江大学 | Piston rod type hydraulic cylinder with internally-arranged ball hinge |
CN105805083A (en) * | 2016-05-16 | 2016-07-27 | 南京晨光集团有限责任公司 | Integrally-designed actuator execution mechanism with spherical hinges internally arranged in piston rod |
US20170328385A1 (en) * | 2016-05-10 | 2017-11-16 | Bauer Deep Drilling Gmbh | Arrangement and method for connecting a hydraulic cylinder |
CN108909690A (en) * | 2018-07-19 | 2018-11-30 | 宁波拓普智能刹车系统有限公司 | A kind of pedal input structure of integrated electrical control braking force aid system |
CN113915193A (en) * | 2021-09-07 | 2022-01-11 | 湖南双达机电有限责任公司 | Anti-collision oil cylinder and pipe string vehicle |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060213748A1 (en) * | 2005-03-26 | 2006-09-28 | Luk Lamellen Und Kupplungsbau Beteiligungs Kg | Hydraulic clutch actuation system |
US7438491B2 (en) * | 2006-07-03 | 2008-10-21 | Eagle Fan | Multi-directional connector |
US20080085151A1 (en) * | 2006-10-04 | 2008-04-10 | Pazdirek Jiri V | Light weight ball joint |
US7722279B2 (en) * | 2007-11-26 | 2010-05-25 | Itt Manufacturing Enterprises, Inc. | Universal insert |
DE102008031640A1 (en) * | 2008-07-04 | 2010-01-07 | Lucas Automotive Gmbh | Piston arrangement for use in brake force producer of motor vehicle brake assembly, has coupling sleeve slipped over free end of force input unit and fixed at transmission component, where coupling sleeve engages head section |
TWM408515U (en) * | 2011-01-14 | 2011-08-01 | Depo Auto Parts Ind Co Ltd | Fastening base structure for vehicle lamp adjustment mechanism |
AT512510B1 (en) * | 2012-04-25 | 2013-09-15 | Avl List Gmbh | Pressure-medium-operated piston-cylinder unit |
DE102015201492A1 (en) * | 2014-02-14 | 2015-08-20 | Schaeffler Technologies AG & Co. KG | Snap connection device and locking receptacle and mounting method |
DE102015202677A1 (en) * | 2015-02-13 | 2016-08-18 | Schaeffler Technologies AG & Co. KG | Piston arrangement for a hydraulic clutch system |
DE102016007906A1 (en) | 2016-06-30 | 2018-01-04 | Fte Automotive Gmbh | Master cylinder, in particular for a hydraulic clutch actuating device in motor vehicles |
DE102016218183A1 (en) * | 2016-09-06 | 2018-03-08 | Continental Teves Ag & Co. Ohg | Brake device for a hydraulic motor vehicle brake system |
DE102016224045A1 (en) * | 2016-12-02 | 2018-06-07 | Zf Friedrichshafen Ag | Ball cup for a ball joint |
DE102017004584A1 (en) | 2017-05-12 | 2018-11-15 | Lucas Automotive Gmbh | Actuating device for a vehicle brake system |
DE102018101409B3 (en) * | 2018-01-23 | 2019-04-04 | Schaeffler Technologies AG & Co. KG | Slave cylinder with several individual pistons; Actuating means; as well as coupling system |
DE102018217422A1 (en) * | 2018-10-11 | 2020-04-16 | Continental Teves Ag & Co. Ohg | Piston unit |
EP3858687A1 (en) * | 2020-01-29 | 2021-08-04 | Continental Automotive GmbH | Unit with an axially operable piston |
US11215221B1 (en) * | 2020-08-27 | 2022-01-04 | Musashi Auto Parts Canada Inc. | Ball joint assembly and method of assembly and ball joint compression ring |
DE102020216513A1 (en) | 2020-12-11 | 2022-06-15 | Continental Teves Ag & Co. Ohg | Hydraulic unit with a detection device for piston position detection |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3107111A (en) * | 1960-08-12 | 1963-10-15 | Bendix Corp | Fastening means for ball-ended members |
US5143469A (en) * | 1990-08-03 | 1992-09-01 | Bendix Italia | Retention socket for a pivot |
US5290120A (en) * | 1991-06-07 | 1994-03-01 | General Motors Corporation | Self-locking ball-and-socket mechanism |
US5335585A (en) * | 1992-04-10 | 1994-08-09 | Fahrzeugtechnik Ebern Gmbh | Master cylinder |
US5499570A (en) * | 1992-02-14 | 1996-03-19 | Itt Automotive Europe Gmbh | Piston with piston rod being latchable through a retaining member |
US6446436B1 (en) * | 1999-10-18 | 2002-09-10 | Luk Lamellen Und Kupplungsbau Gmbh | Master cylinder for use in power trains of motor vehicles |
US6813991B2 (en) * | 2001-03-07 | 2004-11-09 | Lucas Automotive Gmbh | Braking system and force transmission assembly therefor |
US7047868B2 (en) * | 2004-01-30 | 2006-05-23 | Fte Automotive Usa Inc. | Piston and cylinder assembly with push rod retention |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2651838B1 (en) * | 1989-09-13 | 1994-06-03 | Automotive Prod France | PISTON ASSEMBLY FOR USE WITH A HYDRAULIC CYLINDER. |
DE19824530B4 (en) * | 1997-06-06 | 2009-04-23 | Stabilus Gmbh | Ball joint, in particular for a piston-cylinder unit |
DE10062988B4 (en) * | 2000-12-16 | 2005-10-06 | Zf Sachs Ag | Hydraulic actuator on motor vehicles |
-
2004
- 2004-11-05 DE DE102004053913A patent/DE102004053913B3/en not_active Expired - Fee Related
-
2005
- 2005-10-26 DE DE502005003723T patent/DE502005003723D1/en active Active
- 2005-10-26 EP EP05023359A patent/EP1655521B1/en active Active
- 2005-10-28 US US11/261,353 patent/US7188563B2/en not_active Expired - Fee Related
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3107111A (en) * | 1960-08-12 | 1963-10-15 | Bendix Corp | Fastening means for ball-ended members |
US5143469A (en) * | 1990-08-03 | 1992-09-01 | Bendix Italia | Retention socket for a pivot |
US5290120A (en) * | 1991-06-07 | 1994-03-01 | General Motors Corporation | Self-locking ball-and-socket mechanism |
US5499570A (en) * | 1992-02-14 | 1996-03-19 | Itt Automotive Europe Gmbh | Piston with piston rod being latchable through a retaining member |
US5335585A (en) * | 1992-04-10 | 1994-08-09 | Fahrzeugtechnik Ebern Gmbh | Master cylinder |
US6446436B1 (en) * | 1999-10-18 | 2002-09-10 | Luk Lamellen Und Kupplungsbau Gmbh | Master cylinder for use in power trains of motor vehicles |
US6813991B2 (en) * | 2001-03-07 | 2004-11-09 | Lucas Automotive Gmbh | Braking system and force transmission assembly therefor |
US7047868B2 (en) * | 2004-01-30 | 2006-05-23 | Fte Automotive Usa Inc. | Piston and cylinder assembly with push rod retention |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101196208B (en) * | 2006-12-07 | 2011-10-12 | 施塔比鲁斯有限责任公司 | Ball joint arrangement |
FR2924185A1 (en) * | 2007-11-28 | 2009-05-29 | Valeo Embrayages | Clutch master cylinder for clutch of motor vehicle, has collar with front side cooperating with rear edge of piston, where rod is separated angularly above determined angle, where collar applies axial compression force on piston |
CN102913506A (en) * | 2012-11-09 | 2013-02-06 | 浙江大学 | Piston rod type hydraulic cylinder with internally-arranged ball hinge |
US20170328385A1 (en) * | 2016-05-10 | 2017-11-16 | Bauer Deep Drilling Gmbh | Arrangement and method for connecting a hydraulic cylinder |
US10794406B2 (en) * | 2016-05-10 | 2020-10-06 | Bauer Deep Drilling Gmbh | Arrangement and method for connecting a hydraulic cylinder |
CN105805083A (en) * | 2016-05-16 | 2016-07-27 | 南京晨光集团有限责任公司 | Integrally-designed actuator execution mechanism with spherical hinges internally arranged in piston rod |
CN108909690A (en) * | 2018-07-19 | 2018-11-30 | 宁波拓普智能刹车系统有限公司 | A kind of pedal input structure of integrated electrical control braking force aid system |
CN113915193A (en) * | 2021-09-07 | 2022-01-11 | 湖南双达机电有限责任公司 | Anti-collision oil cylinder and pipe string vehicle |
Also Published As
Publication number | Publication date |
---|---|
DE102004053913B3 (en) | 2006-06-14 |
DE502005003723D1 (en) | 2008-05-29 |
EP1655521A1 (en) | 2006-05-10 |
US7188563B2 (en) | 2007-03-13 |
EP1655521B1 (en) | 2008-04-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7188563B2 (en) | Piston arrangement of a hydraulic actuating device on motor vehicles | |
US7287376B2 (en) | Hydraulic cylinder, in particular slave cylinder for a hydraulic clutch actuation system for motor vehicles | |
US6769254B2 (en) | Hydraulic operating systems for clutches and the like | |
US6325194B1 (en) | Hydraulic control clutch device equipped with a guide tube and method for producing such a tube | |
KR101528926B1 (en) | Cylinder, in particular a transmission cylinder for the control device of a hydraulic clutch | |
CN109477500B (en) | Master cylinder, in particular for a hydraulic clutch actuation device in a motor vehicle | |
JP5324443B2 (en) | Blind mount fastener | |
US5947249A (en) | Device for fixing and articulating a master cylinder on a motor vehicle clutch pedal | |
US20030140720A1 (en) | Assembly comprising a spindle and a moving nut | |
GB2050543A (en) | Vacuum brake booster for motor vehicles | |
US5143469A (en) | Retention socket for a pivot | |
CN108025726B (en) | Brake assistance system having an electric motor and method for implementing a brake assistance system having an electric motor | |
US6170365B1 (en) | Socket wrench extension | |
US6899016B2 (en) | Master cylinder | |
US7493849B2 (en) | Hydraulic cylinder, in particular slave cylinder for a hydraulic clutch actuation system for motor vehicles | |
KR100919347B1 (en) | Device for coupling a lever to a shift cylinder piston | |
US11841055B2 (en) | Hydraulic cylinder for controlling a friction clutch in a motor vehicle | |
US20070087081A1 (en) | Stepwise driving force transmission device | |
CN101501371A (en) | Piston portion for a piston assembly and a piston assembly | |
KR20220099115A (en) | Electromechanical driven brake pressure generator | |
US6854271B2 (en) | Hydraulic actuation device in motor vehicles | |
JP5333726B2 (en) | Pneumatic booster | |
CN218343465U (en) | Decoupling type brake booster and vehicle | |
CN113784879B (en) | Piston tube assembly for a spring brake actuator and spring brake actuator | |
KR100402260B1 (en) | structure for assembling between body of clutch master cylinder and tube assembly in car |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: FTE AUTOMOTIVE GMBH, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LIEBIG, DIRK;GEBERT, STEFAN;SPERBER, CHRISTIAN;AND OTHERS;REEL/FRAME:017328/0807 Effective date: 20051121 |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
FPAY | Fee payment |
Year of fee payment: 8 |
|
FEPP | Fee payment procedure |
Free format text: MAINTENANCE FEE REMINDER MAILED (ORIGINAL EVENT CODE: REM.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
LAPS | Lapse for failure to pay maintenance fees |
Free format text: PATENT EXPIRED FOR FAILURE TO PAY MAINTENANCE FEES (ORIGINAL EVENT CODE: EXP.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
|
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20190313 |